ron claiborne, abc news, columbus, ohio. >>> nightmare scenario, ron. all right, thank you. >>> well, 2012 presidential election already made history with a record number of early voters. about 46 million americans, more than one out of every three voters, cast an early ballot this year. our latest polling shows president obama has a narrow three-point lead among those who voted before today. >>> and, of course, there are also 33 senate races to be decided today in addition to the presidential race. among the highest profile races, the one in massachusetts between democrat elizabeth warren and incumbent scott brown, two former governors are facing off in virginia. a democrat, tim kaine, taking on republican george allen. in missouri, claire mccaskill faces republican todd akin. the race, remember, gained national attention after akin's comments about rape and pregnancy. >>> on top of that, several hot button social issues on the ballot for voters to decide. gay marriage is on the ballot in four states. maryland, maine, washington, and minnesota. immigra